26-50 ways to pass the regents

A is the substance being dissolved, while the __ is the substance that dissolves the solute.

solute, solvent

Isotopes are written in a number of ways: C-14 is also __, and is also mass number 14C atomic number 6.

Carbon-14

The distribution of electrons in an atom is its __ configuration.

electron

Electron configurations are written in the __ center of an element’s box on the periodic table in your reference tables.

bottom

Polyatomic ions are __ of atoms with an overall charge.

groups

Coefficients are written in front of the formulas of reactants and products in chemical equations.

coefficients

When naming __________, write the name of the positive ion (cation) first, followed by the name of the negative ion (anion) with the name ending in '-ide.'

binary ionic compounds

________do not form new substances. They merely change the appearance of the original material.

Physical changes

Endothermic reactions____ heat. The energy value is on the _____ of the reaction arrow in a forward reaction.

absorb, left side

Single replacement reactions occur when one element __ another element in a compound.

replaces

Use the_______ on the next page to help you solve conversions between

mole triangle diagram

atoms____energy and electrons move to ____ energy levels (excited)

absorb, higher

when they fall back to ___ levels energy is released by the atom, many times in the form of visible light called an _____

lower, emission spectrum

Chemical formulas are written so that the charges of cations and anions ______ one another.

neutralize

When naming compounds containing polyatomic ions, keep the name of the polyatomic ion the ___ as it is written in Table E.

same

_____ result in the formation of new substances

chemical changes

_____ are on the left side of the reaction arrow and ______are on the right

reactants, products

______ reactions release energy and the energy is a _____in the reaction

Exothermic, product

Only _____ can be changed when balancing chemical equations

coefficients

_____ occur when two or more reactants combine to form a single product.

Synthesis reactions

_____ reactions occur when a single reactant forms two or more products.

Decomposition

______reactions occur when one element replaces another element in a compound.

Single replacement

_______reactions occur when two compounds react to form two new compounds.

Double replacement

The masses of the reactants in a chemical equation is always equal to the masses of the products. “_________.”

Law of Conservation of Mass

The gram formula mass of a substance is the____ of the atomic masses of all of the atoms in it.

sum

Know how to calculate the ______of a compound. (Formula is on Table T.)

percentage composition

Need to know how to do mole to mole _____. use ratio from balanced equation

stoichiometry